Design and control of warehouse order picking: A literature review. - René M. B. M. de Koster; Tho Le-Duc; Kees Jan Roodbergen (Eur. J. Oper. Res., 2007)

Travel time estimation and order batching in a 2-block warehouse. - Tho Le-Duc; René M. B. M. de Koster (Eur. J. Oper. Res., 2007)